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Three-phase alternating current (AC) synchronous oversampling method
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A three-phase alternating current and oversampling technology, which is applied in the direction of measurement using digital measurement technology, can solve the problems of high price, increased cost, and inability to completely eliminate phase angle errors, and achieve the effect of improving sampling accuracy and reducing costs
Inactive Publication Date: 2012-08-15
SHENZHEN CLOU ELECTRONICS
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The above-mentioned conventional sampling method has the following disadvantages: it can only reduce the intersection error (such as IA, UA) between the same phases, and cannot completely eliminate the phase angle error, so it will introduce errors into the calculation of line voltage, power, etc.; ADC is expensive and the cost is greatly increased
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Embodiment 1
[0031] A kind of three-phase alternating current synchronous oversampling method, utilizes analog / digital converter ADC1 to sample, and described oversampling method comprises the following steps:
[0032] A) Define the sampling sequence of ADC1 as follows: UA, UB, UC, UC, UB, UA, the channels IN0~IN6 in ADC1 sample UA, UB, UC, UC, UB, UA respectively, and ADC1 is connected to the CPU through the data bus;
[0033] B) ADC1 samples the three-phase voltage change graph U-t with time, the ordinate indicates the amplitude of the voltage, the abscissa indicates time t, and the value on the abscissa axis indicates the phase angle of the current amplitude; in ADC1, there are six equally spaced Sampling time points t1~t6, each time point samples the voltage of one phase of the three-phase AC, and obtains the voltage sampling values UA1, UB1, UC1, UC2, UB2, UA2 in sequence;
[0034] C) if Figure 4 As shown, in ADC1, the set sampling time t1~t6 interval is very short. In the time in...
Embodiment 2
[0039] A kind of three-phase alternating current synchronous oversampling method, utilizes analog / digital converter ADC1, ADC2 to sample, and described oversampling method comprises the following steps:
[0040] A) if image 3 As shown, the sampling sequence of ADC1 is defined as: UA, UB, UC, UC, UB, UA, and the sampling sequence of ADC2 is defined as: IA, IB, IC, IC, IB, IA; channels IN0 to IN6 in ADC1 are sampled respectively UA, UB, UC, UC, UB, UA, channels IN0~IN6 in ADC2 sample IA, IB, IC, IC, IB, IA respectively; ADC1 and ADC2 are respectively connected to the CPU through the data bus;
[0041] B) if Figure 4 As shown in the diagram U-t of three-phase voltage sampled by ADC1 over time, the ordinate indicates the amplitude of the voltage, the abscissa indicates time t, and the value on the abscissa axis indicates the phase angle of the current amplitude; in ADC1, there are six equal intervals The sampling time points t1~t6 of the three-phase AC power are sampled at eac...
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Abstract
The invention discloses a three-phase alternating current (AC) synchronous oversampling method. An analog to digital convertor ADC1 respectively solves UA1 / UA2, UB1 / UB2 and UC1 / UC2 according to sampling points of three-phase voltage UA, UB and UC for six times; during actual sampling, because the time interval from t1 to t6 is short, a three-phase voltage curve can be regarded as a straight line in the range, the sampling at each point is equal time interval sampling; a value of a UA phase at a delta T moment is the mean value of t1 moment and t6 moment; by parity of reasoning, the sampling value of UB and UC at the delta T moment can be obtained. Therefore, a sampling value can be obtained when the sampling of A, B and C three-phase voltage is positioned at the same time point delta T, and the difference of phase angle brought by asynchronous sampling is eliminated. Meanwhile, delta UA, delta UB and delta UC are obtained by accumulating sampling values twice. The method has oversampling property and improves the sampling accuracy.
Description
technical field [0001] The invention relates to the field of synchronous sampling of three-phase alternating current. Background technique [0002] Three-phase AC synchronous sampling method usually includes [0003] one, figure 1 It is a schematic diagram of dual ADC synchronous sampling. UA, UB, and UC are sampled by ADC1, and IA, IB, and IC are sampled by ADC2. Ideally, at the same time, the ADC should be able to sample 8 channels simultaneously. In this way, the three-phase current, voltage Collected at the same time, there will be no phase angle difference. However, due to the existence of the sampling sequence, there is an error in the sampling time points of the previous channel and the subsequent channel, which can only guarantee that UA and IA at time t1, UB and IB at time t2, and UC and IC at time t3 are sampled at the same time as shown in the figure. [0004] Second, the price of an ADC using multi-channel simultaneous sampling is more than three times that of...
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